If there were no atmosphere around the earth, the temperature of the earth will

Options

A. increase
B. go on decreasing
C. increase during day and decrease during night
D. be unaffected

Explanation

### Step-by-Step Solution:

1. **Understanding the Role of the Atmosphere**: The atmosphere acts like a blanket around the Earth. It plays a crucial role in regulating the temperature by allowing only a certain amount of sunlight to reach the Earth's surface.

2. **Effect of Absence of Atmosphere During Daytime**: If there were no atmosphere, the Earth would absorb excessive heat from the Sun during the daytime. This would cause the surface temperature to rise significantly because there would be no mechanism to limit the amount of heat entering.

3. **Effect of Absence of Atmosphere During Nighttime**: At night, without the atmosphere, the heat absorbed by the Earth during the day would escape into space. This would lead to a drastic drop in temperature, making it extremely cold.

4. **Conclusion on Temperature Variations**: Therefore, without the atmosphere, the temperature on Earth would experience extreme fluctuations: it would become very hot during the day and very cold at night.

5. **Final Answer**: The correct conclusion is that if there were no atmosphere around the Earth, the temperature would increase during the day and decrease during the night.